等值线

The diffraction theory of Kirchhoff is applied to the four-pinhole aperture diffraction screens, the intensity, the zero-contour of the real and imaginary parts of complex amplitude and the phase distribution in deep Fresnel diffraction region are simulated, and it is found that the bright spots in interference field show central symmetry distribution. When the observation plane close to the diffraction screen, the zero-value points of light intensity can form line segment, on which the eccentricities of the light intensity isoline are close or equal to 1, the intensity changes very fast on both sides of the zero-line of light intensity.

利用基尔霍夫衍射理论计算了四圆孔径衍射屏在菲涅尔深区形成的的干涉光场的强度、零值线和相位的分布，发现干涉光场亮斑关于中心呈对称分布，在距离衍射屏较近的观察面上，光强值为的零点组成光强零值线段，该线段上光强等值线的离心率都接近或等于1，其两侧的光强值变化非常剧烈。

Through analyzing the contour map of soil spatial variability, the same changing law was found in soil organic matter and calcium carbonate content in the horizon direction, which showed that higher soil organic matter and calcium carbonate content appeared in the points closer to the village, forming a concentric circle.

经过对土壤特性空间分布等值线图的分析得出：在水平方向上，土壤有机质和碳酸钙均具有相同的变异规律，距离村庄越近土壤有机质和碳酸钙含量越高，以村庄为回心土壤有机质和碳酸钙含量呈同心圆式的空间变异特征。

Therefore, the moist potential vorticity analysis associated with the mesoscale convective system was researched in the paper, so as to reveal the moist potential characteristics of mesoscale convective system in typhoon circulation. The results showed that, during the generation stage, convective instability characterized by MPV1 was a favorable condition for forming MCS, while the vorticity which was caused by the slantwise isentropic surface and the vertical shear of the horizontal wind characterized by MPV2 was an inspiring mechanism. The specific process was that, the atmosphere exhibited the feature of strong convective instability at the low level of convection areas and the southeast areas, which included plenty of erratic energy. The slantwise ascended the stream transfer the erratic energy to northwest, where the stratification stability was small. As decreased, the cyclonic vorticity increased. On the other hand, the vorticity caused by the slantwise isentropic surface and the vertical shear of the horizontal wind inspired the release of convective instability and as a result that the MCS formed. During the development stage, the cyclonic vorticity increased quickly with the persistent decreasing of . Meanwhile, the inclination of isentropic linewas bigger than the absolute momentum line at middle level, which exhibited the feature of conditional symmetric instability , then the conditional symmetric instability was forced to release by the vorticity resulted from the slantwise isentropic surface and the vertical shear of horizontal wind, and the MCS developed.

结果表明，在对流形成阶段，MPV1即对流不稳定为MCS的形成提供背景不稳定条件，由MPV2即湿等熵面的倾斜和水平风的垂直切变而引起的涡旋发展作为强迫机制：MCS形成的区域及东南区域中低层是强对流不稳定层，蕴含丰富的不稳定能量，倾斜上升运动把对流不稳定区具有强不稳定能量的暖湿空气向西北中层的中性层结区输送，由于的减小，气旋性涡度增强，有利于形成对流，另一方面，由于湿等熵面倾斜和低空急流加强而引起的涡旋发展作为一种强迫机制激发对流不稳定能量得到释放，从而形成对流；在对流系统地发展阶段，由于低层的对流不稳定性进一步减弱，进一步减小，气旋性涡度进一步增强，有利于MCS的增强，中层等θe 线的倾斜度比绝对动量M 等值线的倾斜度大，对应有条件对称不稳定区域，满足条件对称不稳定条件，在湿等熵面倾斜和台风低空急流作用下引起的涡旋发展强迫对称不稳定能量释放，从而使得对流得以维持和加强。

A new contour line generating algorithm in rectangular meshes is put forward in this paper also.

本文还提出了一种新的基于矩形网格的等值线生成算法。

This paper introduces a simple but practical method to create high-quality contour line for grid data.

本文介绍了一种简单实用的基于规则格网数据绘制高质量等值线图形的方法。

The outline is t a ken as th a t of the contour line defining its base .

轮廓由确定它的底部的等值线表示出来。

A contour map is one of the most basic and useful geological maps.

等值线图是一种最基本和最常用的地质图件。

With the development and application of the finite element analysis software, higher demand is suggested for quality and efficiency of post-processing. Contour map drawing is especially important for engineering design analysis and improvement.

随着有限元分析软件的开发和应用，对计算成果后处理的质量和效率提出了更高的要求，特别是等值线图的绘制对于工程设计的分析与改进尤为重要。

On the top left of the frame a contour map of the flow temperature is plotted, normalized on the temperature in the chamber.

对左上角的帧一等值线图的流动温度是策划，正常化，对温度在会议厅内。

MapGIS and Surfer have very powerful plotting capabilities, and so they have their advantages in this aspect of drawing plane contour map.

MapGIS和Surfer软件都具备强大的数据绘图功能，在绘制平面等值线图方面各有优势。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。